42421 Per sextant
| 40000 | PERIODONTICS |
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| 42000 | PERIODONTAL SERVICES, SURGICAL |
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| 42400 | PERIODONTAL SURGERY, FLAP APPROACH |
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| 42420 | Flap Approach, With Curettage of Osseous Defect |
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| 42421 | Per sextant | $710.06 | $710.06 |